(Bonus) The built-up wooden beam shown is subjected to a vertical shear of 8 kN. Knowing that the nails are spaced longitudinally every 60 mm at A and every 25 mm at B, determine the shearing force in the nails (a) at A, (b) at B. (Given: I = 1.504 x 10 mm.) 400 50 300 B 50 A 200 Dimensions in mm